Download MendeleyAlternative splicing and allosteric regulation modulate the chromatin binding of UHRF1.
Tauber, M., Kreuz, S., Lemak, A., Mandal, P., Yerkesh, Z., Veluchamy, A., Al-Gashgari, B., Aljahani, A., Cortes-Medina, L.V., Azhibek, D., Fan, L., Ong, M.S., Duan, S., Houliston, S., Arrowsmith, C.H., Fischle, W.(2020) Nucleic Acids Res 48: 7728-7747
- PubMed: 32609811
- DOI: https://doi.org/10.1093/nar/gkaa520
- Primary Citation of Related Structures:
6VED, 6VEE, 6VFO - PubMed Abstract:
UHRF1 is an important epigenetic regulator associated with apoptosis and tumour development. It is a multidomain protein that integrates readout of different histone modification states and DNA methylation with enzymatic histone ubiquitylation activity. Emerging evidence indicates that the chromatin-binding and enzymatic modules of UHRF1 do not act in isolation but interplay in a coordinated and regulated manner. Here, we compared two splicing variants (V1, V2) of murine UHRF1 (mUHRF1) with human UHRF1 (hUHRF1). We show that insertion of nine amino acids in a linker region connecting the different TTD and PHD histone modification-binding domains causes distinct H3K9me3-binding behaviour of mUHRF1 V1. Structural analysis suggests that in mUHRF1 V1, in contrast to V2 and hUHRF1, the linker is anchored in a surface groove of the TTD domain, resulting in creation of a coupled TTD-PHD module. This establishes multivalent, synergistic H3-tail binding causing distinct cellular localization and enhanced H3K9me3-nucleosome ubiquitylation activity. In contrast to hUHRF1, H3K9me3-binding of the murine proteins is not allosterically regulated by phosphatidylinositol 5-phosphate that interacts with a separate less-conserved polybasic linker region of the protein. Our results highlight the importance of flexible linkers in regulating multidomain chromatin binding proteins and point to divergent evolution of their regulation.
- Laboratory of Chromatin Biochemistry, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany.
Organizational Affiliation:
